3(1-7a)=-102

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Solution for 3(1-7a)=-102 equation: 


Simplifying
3(1 + -7a) = -102
(1 * 3 + -7a * 3) = -102
(3 + -21a) = -102

Solving
3 + -21a = -102

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-3' to each side of the equation.
3 + -3 + -21a = -102 + -3

Combine like terms: 3 + -3 = 0
0 + -21a = -102 + -3
-21a = -102 + -3

Combine like terms: -102 + -3 = -105
-21a = -105

Divide each side by '-21'.
a = 5

Simplifying
a = 5

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